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CHANGES FOR VERSION 4.71.0 (as compared to 4.70.5)
Added N-volume bars charts and timeframe
support.
Custom N-volume bar intervals are definable (as usual) in
Tools->Preferences->Intraday.
TimeFrame functions were also
extended to support N-volume bars using new TimeFrameMode() function
calling
TimeFrameMode( 0 );
- switches time frame functions to
time-based operation (the default)
TimeFrameMode( 1 );
- switches
time frame functions to N-tick operation (positive values passed to TimeFrameSet
are treated now as N-tick)
TimeFrameMode( 2 );
- switches time
frame functions to N-volume bar operation (positive values passed to
TimeFrameSet are treated nowas N-volme bars)
Example:
TimeFrameMode( 2 );
TimeFrameSet( 50000 ); // 50'000
share bars..
...do something ...
TimeFrameRestore();
Note: N-volume bars are somewhat weird (compression of data to N-volume
bar may actually deliver MORE output bars - for example if one tick is 1000
shares and you have specified 100V bars then single tick will be expanded to TEN
100V bars - ten times original size)
TimeFrame functions are protected
against array overrun and will not decompress beyond original array size (you
will get an "Error 47. N-volume bar compressed data longer than base time
frame").
Also switching main time frame to some weird N-volume bar value will
result in limiting the output to maximum twice original data size(without error
message).
You should keep that in mind and avoid using too small N-volume
bar intervals that could lead to such condition.
Also due to the nature of
N-volume bars the only TimeFrameSet() function will yield correct N-volume bar
values, TimeFrameGetPrice() may give slightly distorted results.
It is also
possible to use n-volume bars in TimeFrame functions without calling
TimeFrameMode() - it is then necessary to specify n-volume bars as negative
number offset by -1000000 (minus one million):
TimeFrameSet( -1000000 -
2000 );
// gives 2000V barsSimilarly formatted negative numbers will be
reported by Interval() function when n-volume bars are selected.
Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message -----
Sent: Thursday, March 16, 2006 9:30
PM
Subject: [amibroker] 200V Volume
Bar
Hello,
Does
anyone knows if we can have 200V (or any other number for volume) bar charts
with Amibroker ?
Thank
you,
AL,
Please note that this group is for discussion between users only.
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